Files with unknown extensions have blank icons. To read the unknown file extensions, Windows must first determine what program the file is associated with.

To open Hierarchical Annotation Tables or .HAT files on Windows PC, you can use one of these Text Editors or free online tool called HAT Viewer.

Unknown files have become one of the biggest security threats to organizations, catching the attention of C-suite officers. Highly-publicized data breaches at brands like Target, Home Depot and Sony ...